Bulletin of the United States Geological SurveyThe Survey., 1910 - Geology |
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Alabama anticline Bald Eagle Bangor Bangor limestone beds dip Bessemer Big seam Birmingham district Birmingham Valley brown brown-ore Cahaba carries cars cent iron cent silica character Chickamauga Chickamauga limestone Clinton formation Clinton strata coke Conasauga deposits Division dolomite east exposed fault feet thick fossil furnace Geological Survey Graces Gap grade hard Helen-Bess Ida seam inches thick Iron Company Irondale seam Knox dolomite lime carbonate limestone loam locality long tons Louisville and Nashville lower bench Mary Lee McCalley metallic iron mined Morrow Gap nearly northeast northwest oolitic ore-bearing Payne chert places Pratt present probably prospect quarry ravine Readers Gap Red Gap reported ridge sand sandstone semihard Shades Creek Shades Valley shaly shown side silica SiO2 soft southeast southwest Sparks Gap specific gravity Springville strip surface syncline Tennessee Company test pits thin tons Trussville upper bench West Red Mountain Woodward workable
Popular passages
Page 112 - November, 1907 than 5 miles from east to west and 3 miles from north to south. The general dips of the beds are gentle toward the northeast, north, and northwest, but the southwest rim of the syncline has been faulted in at least three places by the warping of the strata, and the...
Page 125 - ... concerning the genesis of the hard ore itself. The mode of occurrence and the constitution of the hard ore do not indicate that it has resulted from the alteration of a rock originally very different in composition, or that it is directly residual from disintegration of rocks containing minor quantities of iron minerals. The hard ore must therefore be regarded as having been formed in essentially its present condition contemporaneously with the inclosing sandstone and shale of the Clinton formation.
Page 46 - This seam consists of 2 to 6 feet of rather siliceous ore associated with 14 to 16 feet of ferruginous sandstone. Ore at this horizon is more continuous and extensive than at the horizon of the Hickory Nut seam.
Page 25 - ... to 0.5 per cent; and water, from 0.5 to 3 per cent. The ore is therefore of non-Bessemer grade. Small quantities of manganese are found in the ore in places. The content of this mineral seldom exceeds 0.25 per cent. In the soft ore the lime generally runs less than 1 per cent, so that the percentages of the other constituents are proportionately higher.
Page 45 - Chert, solidly stratified (Fort Payne). Ft. in. Sandstone, red, with coarse grit 5 8 Grit, coarse, soft, with gray sandstone 5 8 Limestone, gray, hard, cherty 6 7 Limestone, ferruginous 31...
Page 32 - The principal facts supporting the theory of sedimentary origin may be briefly summarized as follows : "1. In mining from slopes running down on the dip of the ore bed, when •once the limit of surface weathering is passed — and this may be at any point from 1 to 100 feet below the outcrop — no further important change in the ore is found with increasing depth ; thougli a number of mine workings are now •close to 2,000 feet from the outcrop.
Page 96 - lower seam," SE. J sec. 20, T. 15 S., R. 1 E M, 430 45 43 26 80 177 DIVISION D. GENERAL DESCRIPTION. Division D includes West Red Mountain from Compton, a small mining town 2 miles north-northeast of Village Springs, to near Tarrant Gap. It comprises a single strip of Clinton formation about 15 miles long. Through the whole distance the Louisville and Nashville Railroad traverses the valley southeast of the ridge at a distance of one-half to 1 mile. The only active ore mine in this division is at...
Page 109 - Beyond this distance there may be a sudden backward and upward bending of the strata, possibly accompanied by faulting, and certainly accompanied by such fracturing of the ore beds as to render them difficult to mine.
Page 197 - To determine the values of a stone as a flux we must deduct the impurities it contains, plus as much of the base as is necessary to flux those impurities. Taking the limestone at 96 per cent lime carbonate, and deducting 8 per cent to take care of its own impurities, we have left 88 per cent of lime carbonate as available flux. Taking the dolomite to contain 2 per cent of impurities and 43 per cent carbonate of magnesia, with 55 per cent of carbonate of lime...
Page 47 - Its soft ore, now nearly all mined out either by surface-trenches or slopes, is the best in the district. Its hard ore is also of high grade, and hitherto has been, for the most part, held in reserve, since ore could be produced from the thicker " Big seam " at a lower cost per unit of iron. The structure and composition of the " Big " and